ULTRAVIOLET SPECTROSCOPIC ANALYSIS OF TRANSIENT MASS FLOW OUTBURST IN U CEPHEI

Tupa, Peter R.; DeLeo, Gary G.; McCluskey, George E.; Kondo, Yoji; Sahade, Jorge; Giménez, Alvaro

doi:10.1088/0004-637X/775/1/46

Title: ULTRAVIOLET SPECTROSCOPIC ANALYSIS OF TRANSIENT MASS FLOW OUTBURST IN U CEPHEI

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Abstract

Spectra from the International Ultraviolet Explorer taken in 1989 September over one full orbital period of U Cephei (U Cep, HD 5796) are analyzed. The TLUSTY and SYNSPEC stellar atmospheric simulation programs are used to generate synthetic spectra to which U Cep continuum levels are normalized. Absorption lines attributed to the photosphere are divided out to isolate mass flow and accretion spectra. A radial velocity curve is constructed for conspicuous gas stream features, and shows evidence for a transient flow during secondary eclipse with outward velocities ranging between 200 and 350 km s{sup –1}, and a number density of (3 ± 2) × 10{sup 10} cm{sup –3}. The validity of C IV 1548 and 1550 and Si IV 1393 and 1402 lines are re-examined in the context of extreme rotational blending effects. A G-star to B-star mass transfer rate of (5 ± 4) × 10{sup –9} M{sub ☉} yr{sup –1} is calculated as an approximate upper limit, and a model system is presented.

Authors:

Tupa, Peter R.; DeLeo, Gary G.; McCluskey, George E. ^[1]; Kondo, Yoji ^[2]; Sahade, Jorge ^[3]; Giménez, Alvaro ^[4]

Physics Department, Lehigh University, Bethlehem, PA 18015 (United States)
NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
Facultad de Ciencias Astronómicas, Paseo del Bosque s/n, B1900FWA-La Plata (Argentina)
Centro de Astrobiologia, CSIC/INTA, Carretera de Torrejon a Ajalvir, E-28850 Torrejon de Ardoz (Madrid) (Spain)

Publication Date:: Fri Sep 20 00:00:00 EDT 2013

OSTI Identifier:: 22270933

Resource Type:: Journal Article

Journal Name:: Astrophysical Journal

Additional Journal Information:: Journal Volume: 775; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; ASTROPHYSICS; CEPHEIDS; COMPUTERIZED SIMULATION; ECLIPSE; MASS TRANSFER; PHOTOSPHERE; RADIAL VELOCITY; S CODES; STAR ACCRETION; T CODES; TRANSIENTS; ULTRAVIOLET RADIATION

Citation Formats


                    Tupa, Peter R., DeLeo, Gary G., McCluskey, George E., Kondo, Yoji, Sahade, Jorge, Giménez, Alvaro, and Caton, Daniel B., E-mail: pet205@lehigh.edu. ULTRAVIOLET SPECTROSCOPIC ANALYSIS OF TRANSIENT MASS FLOW OUTBURST IN U CEPHEI.  United States: N. p., 2013. 
        Web.  doi:10.1088/0004-637X/775/1/46.

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                    Tupa, Peter R., DeLeo, Gary G., McCluskey, George E., Kondo, Yoji, Sahade, Jorge, Giménez, Alvaro, & Caton, Daniel B., E-mail: pet205@lehigh.edu. ULTRAVIOLET SPECTROSCOPIC ANALYSIS OF TRANSIENT MASS FLOW OUTBURST IN U CEPHEI.  United States.  https://doi.org/10.1088/0004-637X/775/1/46

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                    Tupa, Peter R., DeLeo, Gary G., McCluskey, George E., Kondo, Yoji, Sahade, Jorge, Giménez, Alvaro, and Caton, Daniel B., E-mail: pet205@lehigh.edu. 2013.  
        "ULTRAVIOLET SPECTROSCOPIC ANALYSIS OF TRANSIENT MASS FLOW OUTBURST IN U CEPHEI".  United States.  https://doi.org/10.1088/0004-637X/775/1/46.

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@article{osti_22270933,

  title        = {ULTRAVIOLET SPECTROSCOPIC ANALYSIS OF TRANSIENT MASS FLOW OUTBURST IN U CEPHEI},

  author       = {Tupa, Peter R. and DeLeo, Gary G. and McCluskey, George E. and Kondo, Yoji and Sahade, Jorge and Giménez, Alvaro and Caton, Daniel B., E-mail: pet205@lehigh.edu},

  abstractNote = {Spectra from the International Ultraviolet Explorer taken in 1989 September over one full orbital period of U Cephei (U Cep, HD 5796) are analyzed. The TLUSTY and SYNSPEC stellar atmospheric simulation programs are used to generate synthetic spectra to which U Cep continuum levels are normalized. Absorption lines attributed to the photosphere are divided out to isolate mass flow and accretion spectra. A radial velocity curve is constructed for conspicuous gas stream features, and shows evidence for a transient flow during secondary eclipse with outward velocities ranging between 200 and 350 km s{sup –1}, and a number density of (3 ± 2) × 10{sup 10} cm{sup –3}. The validity of C IV 1548 and 1550 and Si IV 1393 and 1402 lines are re-examined in the context of extreme rotational blending effects. A G-star to B-star mass transfer rate of (5 ± 4) × 10{sup –9} M{sub ☉} yr{sup –1} is calculated as an approximate upper limit, and a model system is presented.},

  doi          = {10.1088/0004-637X/775/1/46},

  url          = {https://www.osti.gov/biblio/22270933},
  journal      = {Astrophysical Journal},

  issn         = {0004-637X},

  number       = 1,

  volume       = 775,

  place        = {United States},

  year         = {Fri Sep 20 00:00:00 EDT 2013},

  month        = {Fri Sep 20 00:00:00 EDT 2013}

}

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